Color differences after export (Player issue vs. export issue?)

I'm having an issue with color rendering after export. Admittedly I am no export in the area, so I do my best to explain.

Original File comes as ProRes HQ - edited in Adobe Premiere CC 2015 - color correction was done in there.
After export I am experiencing a shift in color/saturation (perceived) - depening on which player i'm using to view the file.

My actual question is: can Quicktime Player be trusted in regards to "true color rendering"?

Details:
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In Premiere Pro CC2015 (grading is not complete) it looks like this:

When exported to h.264/mp4 using the Quicktime Player to view:

But when using the VLC player to view the exact same file:

The colors seem way more washed out when using Quicktime - especially looking at her skin.
Now - i've read up on the topic - but could not find any definitive answers.
Apparently that is a gamma shift that the Quicktime Player automatically renders?

I've tried exporting the same file as ProRes HQ (not encoding to h.264) - image stays the same/effect stays the same depending on the player.

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Actual QUESTION:

Is this a player issue? Ergo - are the colors of QT player NOT to be trusted?
IS VLC actually depicting the "true colors"?

Other recommondation to ensure correct color rendering of the exported file?